Electronic music, any music involving electronic processing, for example recording and enhancing on tape, and whose reproduction involves the usage of loudspeakers. The theremin is actually a beat-frequency audio oscillator (sine-wave generator) that has two condensers positioned not inside the circuit chassis but, relatively, exterior, as antennas. Simply because these https://www.youtube.com/watch?v=8r_XBrTlws4&t=1s